Interpretive Summary: Ivory Crisp is a new potato variety developed for use in potato chip production. It is a medium maturing variety with medium to high yield potential and high tuber solids (starch content). It is resistant to growth cracks, secondary growth, hollow heart, and stem-end necrosis. It has susceptibility to shatter bruise and common scab. It is notable for its ability to maintain low sugar levels even under long-term storage at temperatures of 4.4 C; temperatures at which many chipping varieties develop high levels of reducing sugars in their tubers resulting in black, unacceptable chips when fried.

Technical Abstract:
Ivory Crisp was released in 2002 by the experiment stations of Idaho, Oregon, Washington, and North Dakota, and by the USDA/ARS. It resulted from a 1980 cross of ND292-1 and A77268-4. Ivory Crisp is suited for use in both the direct delivery and storage chipping markets. Ivory Crisp is a medium maturing potato variety with round, white tubers, and excellent chipping quality. It has medium to high yield potential, high tuber solids, resistance to most internal and external tuber defects, and the ability to chip from cold storage. In trials in Idaho, Oregon, and Washington, total and U.S. No. 1 tuber yield of Ivory Crisp was similar to Atlantic but lower than Chipeta. Yield of tubers in the size range 113 ' 336 g for Ivory Crisp is higher than for either Atlantic or Chipeta. Ivory Crisp is resistant to growth cracks, secondary growth, hollow heart, and stem-end necrosis, but susceptible to shatter bruise. Tuber sugar content has consistently remained low following cold storage and near-acceptable chip color retained at 4.4 C. Ivory Crisp is susceptible or moderately susceptible to most common field diseases of potato. It is highly susceptible to common scab, powdery scab, and pink rot. Tubers of Ivory Crisp have dry matter content (22.4%) lower than those of Atlantic, but higher than those of Chipeta. Glycoalkaloid content of Ivory Crisp tubers is very low (4.3 mg 100 g-1). An application for Plant Variety Protection has been filed for Ivory Crisp. Seed is available from potato seed growers in Idaho, North Dakota and Canada. Small amounts of seed, for research purposes, can be obtained by contacting the corresponding author.